package com.he.security.rsocket.metadata;

import org.reactivestreams.Publisher;
import org.springframework.core.ResolvableType;
import org.springframework.core.codec.AbstractEncoder;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.core.io.buffer.DataBufferFactory;
import org.springframework.core.io.buffer.DataBufferUtils;
import org.springframework.util.MimeType;
import reactor.core.publisher.Flux;

import java.nio.ByteBuffer;
import java.nio.charset.StandardCharsets;
import java.util.Map;

@Deprecated
public class BasicAuthenticationEncoder extends AbstractEncoder<UsernamePasswordMetadata> {


    public BasicAuthenticationEncoder() {
        super(UsernamePasswordMetadata.BASIC_AUTHENTICATION_MIME_TYPE);
    }

    @Override
    public Flux<DataBuffer> encode(Publisher<? extends UsernamePasswordMetadata> inputStream, DataBufferFactory bufferFactory, ResolvableType elementType, MimeType mimeType, Map<String, Object> hints) {
        return Flux.from(inputStream).map(credentials -> encodeValue(credentials, bufferFactory, elementType, mimeType, hints));
    }

    @Override
    public DataBuffer encodeValue(UsernamePasswordMetadata credentials, DataBufferFactory bufferFactory, ResolvableType valueType, MimeType mimeType, Map<String, Object> hints) {
        String username = credentials.getUsername();
        String password = credentials.getPassword();
        byte[] usernameBytes = username.getBytes(StandardCharsets.UTF_8);
        byte[] usernameBytesLengthBytes = ByteBuffer.allocate(4).putInt(usernameBytes.length).array();
        DataBuffer metadata = bufferFactory.allocateBuffer();
        boolean release = true;
        try {
            metadata.write(usernameBytesLengthBytes);
            metadata.write(usernameBytes);
            metadata.write(password.getBytes(StandardCharsets.UTF_8));
            release = false;
            return metadata;
        } finally {
            if (release) {
                DataBufferUtils.release(metadata);
            }
        }
    }
}
